Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c2be84db818459…

MALICIOUS

PDF

104.6 KB Created: 2021-09-01 11:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df3e09835b08e172070d9ba4496fc2b0 SHA-1: 60b8401d7c35a8d90863d84638d7334151ef5d71 SHA-256: a0c2be84db8184594bf507adb232236d1bb26eced0ec4342ac579bb0ec035c2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a 'link farm on disposable hosting'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wolfroccatiassociati.it/userfiles/files/lesat.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085673f38eb5---wowazivobuwafa.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/misimevodazekopife.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/zanasililixuvunume.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/54694988305.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/daxejol.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/mamapumiju.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/2519713902.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/41932251259.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105830d60396---bisowowuzopivurux.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/67248887727.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/36823887653.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210718172013_c5hscx.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xaxavikuritiji.pdfIn PDF document text
    • http://live-net.it/file/68720969946.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/lezekajujokabivan.pdfIn PDF document text
    • https://primer-spb.ru/files/files/55911430020.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/79565711505.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/sunoxoliderumigukifuxexe.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/5198928410.pdfIn PDF document text
    • http://newmob.it/userfiles/files/90950929481.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/35846374001.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/87951475180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=short+poem+written+by+rabindranath+tagorePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 17852 bytes
SHA-256: 421ee721ba10f538d346dcb783594223e2a4f9e78420c52d93138637852fa1c4
font_01_sfnt_off000163d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D9 11040 bytes
SHA-256: 8b2c423eb9314987a5e623ce0e1f0d4c2458a0ae0516339c64afd635625bedae
font_02_sfnt_off00017d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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